| 土岩复合地层中CRD隧道施工的变形监测与风险控制 |
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| 引用本文： | 宁方端,姚爱军,王天佐,彭虎.土岩复合地层中CRD隧道施工的变形监测与风险控制[J].地震学刊,2014(3):383-388. |
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| 作者姓名： | 宁方端 姚爱军 王天佐 彭虎 |
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| 作者单位： | 北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 |
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| 基金项目： | 北京市教育委员会科技计划项目（KM200910005012）;城市与工程安全减灾教育部重点实验室项目（2013ZD01）资助 |
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| 摘 要： | 以典型城市土岩复合地层中的某地铁CRD（交叉中隔壁法）隧道为依托,通过分析洞内、外变形监测数据,总结变形规律,对该隧道风险进行有效控制。研究结果表明：洞内、外变形量的60%以上是由上2层导洞开挖引起的;隧道开挖引起的地表沉降槽特征较为明显,地表最大沉降点位于隧道中心线上方偏左;隧道掌子面开挖的横向影响明显,范围约为60m。洞内变形监测的分析指标以拱顶沉降为主,水平收敛为辅;拱顶下沉曲线分段组成,总体呈台阶状下降。综合变形监测分析和施工经验认为：施工中应着重控制上2层导洞初期支护结构的及时闭合;相邻导洞掌子面间距控制在15~20m;台阶长度控制在5m以内,及时封闭仰拱,闭合成环,可有效地控制洞内、外变形和保证初期支护结构稳定性。
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| 关 键 词： | 土岩复合地层 变形监测 交叉中隔壁法(CRD) 地铁风险控制 |
Deformation Monitoring and Risk Control of CRD Tunnel Construction in Compound Rock and Soil Strata |
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| NING Fang-duan,YAO Ai-jun,WANG Tian-zuo,PENG Hu.Deformation Monitoring and Risk Control of CRD Tunnel Construction in Compound Rock and Soil Strata[J].Journal of Seismology,2014(3):383-388. |
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| Authors: | NING Fang-duan YAO Ai-jun WANG Tian-zuo PENG Hu |
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| Institution: | (The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China) |
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| Abstract: | This thesis analyses the deformation monitoring data inside and outside the tunnel, summarizes the deformation rules, and controls the tunnel risks based on the subway Cross Diaphragm （CRD） tunnel in compound strata of rock and soil of a typical city. The results show that over 60 % of the total deformation inside and outside the tunnel is caused by the pilot tunnel exca- vation of the first two layers; the surface subsidence caused by tunnel excavation is relatively obvious, and the largest ground settlement site lies at the left side above the center line of the tunnel; tunnel face excavation has obvious influence on surface subsidence, with the horizontal range of influence being about 60 meters; monitoring within the tunnel should be based more on vault settlement and be supplemented by horizontal convergence; vault settlement consists of piecewise curve, with the overall shape of decreasing and gradually stabilizing in the end. This thesis makes a conclusion by combining the deformation monitoring analysis with the field construction experience, which is as follows： close in a timely manner the initial supporting structure of the pilot tunnels on the first two layers during excavation; the distance between the tunnel face of two adjacent pilot tunnels should be controlled from 15 to 20 meters; the length of the steps should be controlled within 5 meters; close the inverted arch timely, forming a loop. The above-mentioned measures will effectively control the deformation in or out of the tunnel and ensure the stability of the initial supporting structure. |
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| Keywords: | compound rock and soil strata deformation monitoring Cross Diaphragm （CRD） subway risk control |
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